Partial encapsulation of adhesive coating materials on envelop flaps - for pressure sensitive bonding using various adhesive systems

摘要

Mutually adhesive coatings on complementary regions of one article such as an envelope or self-sealing postcard are inhibited from premature adhesion by enclosing >=1 part of the coating system in microcapsules bonded to the support surface and inert until subjected to sufficient pressure to break the capsules. Esp. suitable for two-component adhesive systems, with the catalytic component being encapsulated. This avoids use of ancillary temporary interlayers such as siliconised paper and can be used for application of a wide variety of adhesive systems and for cold or hot pressure sealing processes. For water soluble adhesives, the encapsulated agent may be water.